I have made clothing with an avatar model in Blender...

[SeektheTruth1122]

I have made clothing on avatar models in Blender 2.64, but I have no idea how to import them from Blender 2.64 to Second life. Help please? What should I download so I can import my clothing and sell it in a store???

[Rolig Loon]

If you are making rigged mesh clothing, you should probably be using Avastar, which handles all of the tricky steps in making mesh clothing for SL, including exporting it.  See also Nalates's blog for a number oif her short tutorials.